Muffler



E. TYLE MUFFLER Filed Jun 1 1925 VENToR TYLEz BYM ORNEY Patented Sept; 25, 1928.-

H ARVEY E. TYLER, OF CHICAGO, ILLINOIS.

MUFFLER.

A Application filed June 13,

M invention relates to improvements in mm ers, and it consists in the combinations, constructions, and arrangements herein described and claimed.

An object of my invention is to provide a muffler that is adapted to break up the ex-' haust ases into fine streams so as to change the pu sating flow of the gases into a uniform flow, and to also cause these gases to flow. along the exterior wall of the muffler, whereby the gases willbe cooled.

A further object of iny invention is to pro- Vide amufiler of the type described in which the gases are projected against a cool metal surface thereby agitating the gases so that all parts are effectively and: quickly cooled.

A further object of my invention is to pro vide a muffler of the type described which is extremely simple in construction, durable and efiicient for the purpose intended.

Other objects and advantages will appear in the following specification, and the-novel features of the invention. will be particularly pointed out in the appended claims.

My invention is illustrated in the accompanying drawings, forming part of this application, in which Figure 1 is a longitudinal view of my preferred type of muflier,

Figure 2 is a longitudinal View of a modified form of the device,

Figure3 is-a longitudinal view of another modified form of the device, and

Figure 4 is a section along the line 44 of Figure 3.

In carrying out my invention I provide a muflier that comprises an outer casing 1 which is preferably cylindrical ill-cross section. In this casing are disposed two cupshaped members 2 and 3 that are identical to each other. A description of one will there fore suffice for both.

The cup-shaped member has an open end 4 that faces toward the exhaust pipe '5. The

periphery of the openend 4 is of such a size as. to snugly engage with the inner wall of the casing 1. The member 2 may be frictionally' secured in place or may be spotwelded or the like.

1925. Serial No. 36,911.

indicated by the arrows. As heretofore stated, the wall 6 is long and therefore keeps the exhaust gases in contact with the casing wall 1, whereby the exhaust gases are cooled. The exhaust gases in passing into the muffler first flow to the rear of the cup-shaped member 2 whereupon they are caused to flow back upon themselves due to the wall-10. From this-point the gases will flow through the openings 9 and will strike the casing 1 when flowing ina direction at right anglesto the casing. The gases willthenbe directed betweenthe wall 6 andthe wall 1 and will flow into the compartment 11 disposed between the two cup-shaped members 2 and 8.

As heretofore stated, the cup-shaped memher 3 is identical. to the cuphaped member 2 and therefore the same reference numerals will designate corresponding parts. The cup-shaped member 3will retard the flow of gases to the compartmentll' and will therefore force the gases against the casing wall 1 so as to effectually cool a the gases. The

gasesfwill flow from the compartment 11' through the openings .9 in the cup-shaped member 3 and thence to the end of the muffler where they will be ejected.

From the foregoing description of the va of may be readilyunderstood. The form of mufiler just described is very simple in construction andprovides a novel means for retarding the flow of gases through the muffler, for breaking the flow of gases up into small streams, for causing these streams to lay on the cool surface of the casing 1, and

or keeping the gases in contact with this surface for a long time. I

In Figure 2, I show a slightly modified form of thedevice. In this form of the device,

the casing 20 has a bafile plate 21 that stops the flow of gases through the casing. The

casing also has openings 22 therein which.

are disposed quite a distance from the baflie late'21. The gases flowing through the easmg 20 will strike the baflie plate 21 and will then be directed back on themselves to the openings 22. At this point the gases will pass through the openings in small streams that extend at right angles'to an outer shell 23. This shell of course is cool and will therefore cool the gases that come in contact therewith. The shell 23 is relatively long and provides a long passa eway for the gases. In this way I provi e novel means for keeping thegases contactwith acool j surface during the greater part of their passage through the muffler.

The ends of the shell 23 are bent inwardly and are secured to the casing 20. The shell 23 projects beyond the bafile plate 21 so as to carry the gases beyond the baflie plate 21.

Openings 24 are provided in the casing 20 of the modified form of the device which is similar to the preferred form of the device is to provide a muffler which is simple in construction and made from very few parts.

In Figure 3 I show still another modified form of the device. In this form of the device, the casing 30 is provided with a bafile plate 31 of a peculiar shape. The battle plate 31 has one of its ends secured to the casing 30 for a. portion of its length and then the baffle plate is bent at an angle to the longitudinal axis of the casing so as to finally bear against the surface of the casing 30 disposed diametrically opposite the part of the casing receiving the first end of the bafile plate.

The inclined portion 32 of the baffie plate is provided with curved edges 33 (see Figure 4) that are spaced slightly from the casing 30 so as to provide small spaces 34 through which the gases are forced. The gases in passing the inclined portion 32 are forced against the outer casing 30 and are thereby cooled.

The baftle'plate 31 is again bent at 35 in a manner similar to that of 32. The shape of the portion 35 therefore needs no further description since the shape of the portion 32 has been clearly described. The gases passing the portion 35 are forced against the outer casing 30 and are cooled, and furthermore the gases in passing the portion 35 restrict the flow of gases through the compartment 36 formed by the portions32 and 35. This restricted movement of the gases forces the gases against the outer casing 30 which also aids in cooling the gases. The portions 37,-

38, and 39 of the baffle plate 31 are curved so as to conform to the curvature of the easing 30. If desired the baffle plate 31 may have as many inclined portions 32 and 35 as needed so as to provide an efficient means for cooling the gases and for causing the gases to flow uniformly from the mufiier.

It will thus be seen that instead of having a core of hot gases which pass through the niufller with very little cooling as in the ordinary type of 'muffler, I providemeans by which the gases are caused to impinge against a cool metal surface thereby quickly reducing the temperature of the gases, and thus causing less noise when the gases are finally expelled into the atmosphere. I

I claim:

A device of the type described comprising a casin g, a relatively long cup-shaped member having an open end, a c osed end, and a plurality of openings eircumferentially disposed adjacent the open end, a relatively short enlarged portion rigidly secured to the inner wall of said casing, and a partition connecting said enlarged portion to said relatively long cup-shaped member, said cup-shaped member being adapted to cause gases of combustion to backup on themselves and pass through said openings, said cup-shaped member being disposed in close proximity to the inner wall of said casing, whereby the gases of combustion passing through the openings will be held against the inner wall of said casing and become cooled.

HARVEY E. TYLER. 

